Arrange 4 types of coal in increasing order of Carbon content and Hardness : .Lignite-20% , peat-80% , Bituminous, 40% , Anthracite-10% .Peat-20% , Lignite-20-40%, Bituminous-80%, Anthracite-90% .Anthracite-80%, Lignite-10% , Bituminous-20% , Peat-90% .Lignite-20% , peat-40% , Bituminous, 80% , Anthracite-10%

Ican determine the molar mass of an element by looking on the under the atomic mass for the element. for example the molar mass of phosphorus is 30.974 grams/mole. avogadro’s number tells me the amount of representative particles in 1 mole of any substance. this means 12.011 gram sample of carbon and a 32.0 gram sample of sulfur have the same number of atoms.